Airtight gasket for pneumatic tool

Abstract

An airtight gasket for a pneumatic tool including an airflow regulation portion, an air intake passage to direct high pressure air into the airflow regulation portion and a pneumatic motor to receive the high pressure air from the airflow regulation portion and generate spinning. The airflow regulation portion includes a regulation valve which contains a flow directing vent corresponding to the air intake passage and a recess surrounding the flow directing vent. The airtight to gasket is clamped between the regulation valve and air intake passage, and includes a base located in the recess, a through-hole located on the base to channel the high pressure air into the flow directing vent, and an airtight convex ring surrounded the through-hole and extended integrally from the base towards to air intake passage.

What is claimed is: 
     
         1 . An airtight gasket for a pneumatic tool including an airflow regulation portion, an air intake passage to direct high pressure air to enter the airflow regulation portion and a pneumatic motor to receive the high pressure air from the airflow regulation portion to spin, the airflow regulation portion including a regulation valve, the airtight gasket being clamped between the regulation valve and the air intake passage, the regulation valve including a flow directing vent opened and corresponding to the air intake passage to receive the high pressure air and a recess surrounding the flow directing vent, the airtight gasket comprising:
 a base located in the recess of the regulation valve;   a through-hole formed on the base and communicated with the air intake passage and the flow directing vent to receive the high pressure air; and   an airtight convex ring surrounded the through-hole and extended integrally from the base towards the air intake passage.   
     
     
         2 . The airtight gasket of  claim 1 , wherein the airtight convex ring surrounds a scope greater at least than the inner diameter of the air intake passage. 
     
     
         3 . The airtight gasket for pneumatic tools of  claim 1 , wherein the airtight convex ring surrounds a scope in a selected geometric shape. 
     
     
         4 . The airtight gasket of  claim 1  including a retaining wall extended from the through-hole to the regulation valve in contact with an inner rim of the flow directing vent. 
     
     
         5 . The airtight gasket of  claim 1 , wherein the airtight gasket is made from a flexible material. 
     
     
         6 . The airtight gasket of  claim 5 , wherein the flexible material is rubber. 
     
     
         7 . The airtight gasket of  claim 1 , wherein the regulation valve includes an assembly element to contain the flow directing vent and the recess and anchor on the pneumatic tool, and a rotary valve ring located on the assembly element and turnable to change the direction of the high pressure air.